MB-48731: Decrease ngx-clipboard version due to Angular compatibility.

ngx-clipboard should have '12.3.1' version for Angular 8 and remove
redundant ui-select.

Change-Id: Iea5a1bc88d57c9c699929d8ed23e01d2840cc8a0
Reviewed-on: https://review.couchbase.org/c/ns_server/+/165859
Tested-by: Raluca Lupu <[email protected]>
Reviewed-by: Pavel Blagodov <[email protected]>
Well-Formed: Build Bot <[email protected]>

Author: lukaisthewolf